.TH std::basic_string_view::npos 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
std::basic_string_view::npos \- std::basic_string_view::npos

.SH Synopsis
   static constexpr size_type npos = size_type(-1);  \fI(since C++17)\fP

   This is a special value equal to the maximum value representable by the type
   size_type. The exact meaning depends on context, but it is generally used either as
   end of view indicator by the functions that expect a view index or as the error
   indicator by the functions that return a view index.

.SH Example


// Run this code

 #include <string_view>

 constexpr bool
 contains(std::string_view const what, std::string_view const where) noexcept
 {
     return std::string_view::npos != where.find(what);
 }

 int main()
 {
     using namespace std::literals;

     static_assert(contains("water", "in a bottle of water"));
     static_assert(!contains("wine", "in a bottle of champagne"));
     static_assert(""sv.npos == "haystack"sv.find("needle"));
 }

.SH See also

   npos     special value. The exact meaning depends on the context
   \fB[static]\fP \fI\fI(public static member\fP constant of\fP
            std::basic_string<CharT,Traits,Allocator>)
